| Road structure combination design usually accords to the design and experience of road in our country for a long time. But there have no very clear and definite design philosophy so far ,say nothing of quantitative structure combination design method. Compare to other countries, our economic falls behind, and we still adopt the road structure combination design thought of " strong base, face slightly". With the speeding develop of our economic, this designs thought have already can not satisfied traffic's need , road nonage damages are very gravely, to grow in intensity .The stiffness of sem i-rigid base is too big and irrationally match with base modulus is the main reason of shear breakage. With semi i-rigid base stiffness increasing by, the shear strength of road surface increases by rapidly which induce tier of pitches to shear flow and the rift destroying , for example: the track , the surface (Top-down) crack etc.The main body of the text is through analysis the fact that nonage destroys phenomenon of the road , to find out material constituting the law and the impact of environment and load over shearing breakdown. Construct a model on this basis, Mechanics calculates analysis in progress. Through analysis the various phenomenon, we can find out various factor relation to shear breakage and the forming mechanism of shear breakage. At last, validate the conclusion in form of trial. |
